You can change the browser agent id, chrome browser would be the closest to Seamonkey. I do not know why its shown as a mobile browser ( ARM flag I guess ). I do not know how but when you figure out which of the few methods work to change browser agent label let us know.

Firefox has a useragent addon/extension that enables you to pick or set what useragent is presented to sites. Don't know if that's also available for seamonkey though. If not then the about:config firefox entry is a string entry of general.useragent.overridepreference that if created you can set to perhaps one of the main choices taken from here so as to pretend to be something else. Again I don't know if its the same about:config entry as in seamonkey.

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